Cyber and Data Security Incident Response Plan Template

Standard Operating Procedure: Cyber and Data Security Incident Response (IR)

1. Executive Summary & Purpose

This document establishes the institutional framework for detecting, analyzing, and mitigating cybersecurity incidents. The purpose is to minimize operational downtime, protect data integrity, and ensure compliance with regulatory notification requirements. This SOP adheres to the NIST SP 800-61 Rev. 2 incident handling lifecycle.

2. Scope & Prerequisites

• Scope: All digital assets, cloud environments, on-premises infrastructure, and personnel-accessible endpoints within Template Registry purview.
• Tools Required: SIEM (Security Information and Event Management), EDR (Endpoint Detection and Response), out-of-band communication platform (e.g., Signal or encrypted Slack), forensic imaging tools.
• PPE: N/A (Digital focus; physical security incidents escalate to Physical Security SOP).

3. Roles & Responsibilities (RACI Matrix)

4. Step-by-Step Procedure

Phase I: Detection and Analysis

• Verify the validity of the security alert via SIEM/EDR logs.
• Determine the scope (single workstation vs. domain-wide).
• Initiate the Incident Log (chronological timestamped record).
• Classify incident severity (Low, Medium, High, Critical).

Phase II: Containment

• Short-term: Isolate affected segments/hosts from the production network.
• Long-term: Patch vulnerabilities or rotate compromised credentials.
• Take forensic snapshots of memory and disk before modification.

Phase III: Eradication

• Identify and remove malware, unauthorized accounts, or persistence mechanisms.
• Perform root cause analysis (RCA) to ensure the vector is closed.
• Rebuild compromised systems from hardened images (do not "clean" infected systems).

Phase IV: Recovery

• Restore data from known-good backups.
• Monitor systems for abnormal behavior or "re-infection" signatures.
• Perform a full security scan of restored assets.

Phase V: Post-Incident Activity

• Conduct a "Lessons Learned" meeting within 72 hours.
• Update the threat model to prevent recurrence.
• Finalize the Incident Report for executive leadership.

5. Quality Assurance & Pro-Tips

• Pro-Tip 1: Out-of-Band Communication. Never communicate about a breach on the infrastructure being breached. If your email is compromised, assume attackers are reading your incident Slack.
• Pro-Tip 2: Forensics First. Do not reboot a compromised server unless necessary for immediate containment; you will lose volatile memory artifacts (RAM).
• Metric Thresholds:
  • Mean Time to Detect (MTTD): Target < 4 hours.
  • Mean Time to Contain (MTTC): Target < 2 hours post-detection.
• Pitfall: Avoid the "Panic Patch." Rushing to fix things without isolating often triggers logic bombs or automated attacker scripts.

6. Frequently Asked Questions

Q: Should I notify law enforcement immediately? A: Consult with Legal/Compliance first. Premature notification can trigger public disclosure obligations before the scope is fully understood.

Q: When is it appropriate to pull the "Kill Switch" (Full network shutdown)? A: Only when data exfiltration is confirmed and automated containment via EDR fails to stop the threat. The IC must weigh the cost of downtime against the cost of data loss.

Authorized by: Julian Vance, Chief Architect, Template Registry.